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Tests.startUnit = function () {
    var canvas = document.getElementById('gl');
    var gl = wrapGLContext(canvas.getContext(GL_CONTEXT_ID));
    var buf = gl.createBuffer();
    var ebuf = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, buf);
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebuf);
    return [gl, buf, ebuf];
}

Tests.testBufferData = function(gl) {
    var data = [0,0,0,0, 1,0,0,0, 0,1,0,0];
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(data), gl.STREAM_DRAW);
    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(data), gl.STREAM_DRAW);
    assertOk("zero length data",
        function(){gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array(0));});
    assertFail("number for data",
        function(){gl.bufferSubData(gl.ARRAY_BUFFER, 0, 12);});
    assertFail("bad target",
        function(){gl.bufferSubData(gl.TEXTURE_2D, 0, new Float32Array([1,2,3]));});
    assertFail("array for data",
        function(){gl.bufferSubData(gl.ARRAY_BUFFER, 0, [1,2,3]);});
    assertOk("floats in element buffer",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Float32Array([1,2,3]));});
    assertFail("negative offset",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, -1, new Uint16Array([1,2,3]));});
    assertFail("offset out of range",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 24, new Uint16Array([1,2,3]));});
    assertFail("offset out of range",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 2400000, new Uint16Array([1,2,3]));});
    assertFail("offset out of range",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 19, new Uint16Array([1,2,3]));});
    assertFail("data too large",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint16Array(data.concat([1])));});
    assertOk("offset + data too large",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 18, new Uint16Array([1,2,3]));});
    assertOk("good args",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint16Array([1,2,3]));});
    throwError(gl, 'bufferData0');
    gl.bindBuffer(gl.ARRAY_BUFFER, null);
    assertFail("setting buffer 0",
      function(){gl.bufferSubData(gl.ARRAY_BUFFER, 0, new Float32Array([1,2,3]));});
    throwError(gl, 'bufferData1');
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
    assertFail("setting buffer 0",
        function(){gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, new Uint16Array([1,2,3]));});
    throwError(gl, 'bufferData2');
}

Tests.endUnit = function(gl, buf, ebuf) {
    gl.deleteBuffer(buf);
    gl.deleteBuffer(ebuf);
}

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<canvas id="gl" width="16" height="16"></canvas>
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